01: /*
02: * $Id: CompressedLobSource.java,v 1.3 2004/09/09 23:47:42 ahimanikya Exp $
03: * =======================================================================
04: * Copyright (c) 2002 Axion Development Team. All rights reserved.
05: *
06: * Redistribution and use in source and binary forms, with or without
07: * modification, are permitted provided that the following conditions
08: * are met:
09: *
10: * 1. Redistributions of source code must retain the above
11: * copyright notice, this list of conditions and the following
12: * disclaimer.
13: *
14: * 2. Redistributions in binary form must reproduce the above copyright
15: * notice, this list of conditions and the following disclaimer in
16: * the documentation and/or other materials provided with the
17: * distribution.
18: *
19: * 3. The names "Tigris", "Axion", nor the names of its contributors may
20: * not be used to endorse or promote products derived from this
21: * software without specific prior written permission.
22: *
23: * 4. Products derived from this software may not be called "Axion", nor
24: * may "Tigris" or "Axion" appear in their names without specific prior
25: * written permission.
26: *
27: * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
28: * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
29: * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
30: * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
31: * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
32: * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
33: * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
34: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
35: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
36: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
37: * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
38: * =======================================================================
39: */
40:
41: package org.axiondb.types;
42:
43: import java.io.IOException;
44: import java.io.InputStream;
45: import java.io.OutputStream;
46: import java.util.zip.GZIPInputStream;
47: import java.util.zip.GZIPOutputStream;
48:
49: import org.axiondb.AxionException;
50:
51: /**
52: * A {@link LobSource} that compresses/decompresses
53: * the input/output streams using GZIP compression.
54: *
55: * @version $Revision: 1.3 $ $Date: 2004/09/09 23:47:42 $
56: * @author Rodney Waldhoff
57: */
58: public class CompressedLobSource implements LobSource {
59: public CompressedLobSource(LobSource source) {
60: _source = source;
61: }
62:
63: public long length() throws AxionException {
64: throw new AxionException(
65: "Can't get the length of compressed lob types.");
66: }
67:
68: public void truncate(long length) throws AxionException {
69: if (0 == length) {
70: _source.truncate(length);
71: } else {
72: throw new AxionException("Length must be 0, found "
73: + length + ".");
74: }
75: }
76:
77: public InputStream getInputStream() throws AxionException {
78: try {
79: return new GZIPInputStream(_source.getInputStream());
80: } catch (IOException e) {
81: throw new AxionException(e);
82: }
83: }
84:
85: public OutputStream setOutputStream(long pos) throws AxionException {
86: if (pos != 0L) {
87: throw new AxionException("Position must be 0, found " + pos
88: + ".");
89: }
90:
91: try {
92: return new GZIPOutputStream(_source.setOutputStream(pos));
93: } catch (IOException e) {
94: throw new AxionException(e);
95: }
96: }
97:
98: private LobSource _source = null;
99: }
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